for anyone who is -- pays attention to american foreign policy and military affairs you know that ever since the attacks on this country on 9/11 the united states has had to evolve militarily and in the intelligence community to meet the challenge of this new enemy and more than anyone i can think of, general mcchrystal has been responsible for shaping the evolution and developing what i call the targeting engine which is what we adopted as the primary method of defending the country. thank you for being here, great to see you. >> thanks for two kind introduction. i thought of you as a nonfiction writer but you have gone into fiction now. >> you were the commander of special operations in iraq and afghanistan and there have been a rapid evolution. i am familiar from writing blackhawk down the way things were nearly 90s. can you give us an idea of the overall strategy that has evolved and we will get to specifics but also the tactics you have developed? >> a group of people did. thanks. taking it back a little bit at the end of the vietnam war as america has done at the end of other war